@BG:#536438;
@height:100px;
.nav-header{
    position: fixed;
    height: @height;
    top: 0;
    left: 0;
    z-index: 1000;
    box-sizing: border-box;
    text-align: center;
    line-height: @height;
    background-color: @BG;
    color: #FFF;
    font-size: 0.7rem;
    width: 100%;
    display: flex;
    justify-content: flex-start;
    align-items: center;    
    padding-left: 10px;/* no */
    span.content{
        flex-basis: 80%;
    }
}